Radioactive tags show how plant growth regulators act
Series: Picture story -- no. 44; Picture story (United States. Department of Agriculture) -- no. 44.
Publisher: U.S. Dept. of Agriculture, Office of Information, Press Service
Published: 1947
Place of publication: Washington, D.C
Language: eng
Subjects: Growth (Plants); Biological control systems
Notes: Caption title.

"November 30, 1947."